Lighting unit



FIG. 1 is a front isometric view thereof;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a top view thereof, the bottom view being the same;

FIG. 5 is a left side elevation view thereof;

FIG. 6 is a right side elevation view thereof; and,

FIG. 7 is a rear isometric view thereof.

The broken lines are for purposes of illustration and form no part of the claimed design. 

The ornamental design for a lighting unit, as shown and described. 